I'd like to do something with QoC, but the big issue there is the storage and processing requirements - we'd need to track the amount of time each player spends on the ice with every other player in the league and then derive the quality numbers from that. Across 20+ leagues, that's really going to slow things down, to a degree that's probably not worth what you'd gain from being able to present the stat. You can get around that to an extent by using depth chart place as a proxy for specific player identifications, but that prevents the more common usages of QoC.
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